GUIDANCE ON VALVE TYPE SELECTION -b.ricardo

GUIDANCE on valves Type SELECTION VALVE TYPE SELECTION . VALVE type SELECTION should take account of : 1. Required function. 2. Service conditions. 3. Fluid type and condition. 4. Fluid characteristics. 5. Frequency of operation. 6. Isolation requirements. 7. Maintenance requirements. 8. Environmental considerations. 9. Past experience in comparable conditions. and size. 1. Required VALVE function and description Isolation (block) valves valves intended for starting and stopping flow or for isolation of equipment generally be selected to provide: Low resistance to flow (low pressure drop) by means of a straight through flow configuration which may also facilitate line clearing. Bi-directional sealing providing good shut off when the flow or pressure differential is from either direction. The most common types of block valves include: gate valves wedge /parallel slab/parallel expanding/parallel slide.

j. Class 150 stainless steel wedge gate valves are sometimes specified in accordance with API Std 603 which allows reduced wall thickness on the grounds that the material does not corrode. k. Gate valves < DN 50 (NPS 2) are normally provided with reduced (sometimes called conventional or

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  Class, Valves, Gate, Gate valves, Wedge, Class 150, Wedge gate valve

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